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Improved convertible authenticated encryption scheme with provable security

Improved convertible authenticated encryption scheme with provable security,10.1016/j.ipl.2011.03.021,Information Processing Letters,Han-Yu Lin,Chien-

Improved convertible authenticated encryption scheme with provable security  
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Convertible authenticated encryption (CAE) schemes allow a signer to produce an authenticated ciphertext such that only a designated recipient can decrypt it and verify the recovered signature. The conversion property further enables the designated recipient to reveal an ordinary signature for dealing with a later dispute over repudiation. Based on the ElGamal cryptosystem, in 2009, Lee et al. proposed a CAE scheme with only heuristic security analyses. In this paper, we will demonstrate that their scheme is vulnerable to the chosen-plaintext attack and then further propose an improved variant. Additionally, in the random oracle model, we prove that the improved scheme achieves confidentiality against indistinguishability under adaptive chosen-ciphertext attacks (IND-CCA2) and unforgeability against existential forgery under adaptive chosen-message attacks (EF-CMA).
Journal: Information Processing Letters - IPL , vol. 111, no. 13, pp. 661-666, 2011
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